Device for truing up shafts



April 21 1942 H. GossTRoM 2,280,646

v DEVICE FOR TRUING UP sHAFTs Filed Feb. 12, 1940 Patented Apr. 21, 1942Ni? STS DEVICE FOR TRUING UP SHAFTS Hugo Gosstrom, Dallas, rIlex.

Application February 12, 1940, Serial No. 318,472

4 Claims.

This invention relates to new and useful improvements in cutting tools.

One object of the invention is to provide an improved cutting tool foraccurately turning or truing up shafts, the device being particularlyadapted for use on crankshaits of internal combustion engines and beingarranged so that removal of the shaft from the engine is not necessaryin order to perform the cutting operation.

An important object ci the invention is to provide an improved cuttingtool ior turning crankshafts to remove the unevenly worn surfaces of thecrankshaft and to true up the crankshaft bearings, said tool having aplurality of guide elements and a cutting member disposed radiallywithin a housing, together with improved means for adjusting theelements and member, whereby the tool may be readily adjusted for use onshafts of various diameters.

Another object of the invention is to provide an improved cutting tool,of the character described, wherein the cutter proper has its cuttingpoint in direct radial alinement with the center of the shaft beingturned, whereby chattering of the tool during the cutting operation isprevented and also whereby a more eilicient cutting action is produced.

A further object of the invention is to provide an improved cutting toolhaving its guide elements and cutting member mounted for radialadjustment with respect to the shaft being worked upon; said adjustmentbeing accomplished by means of threaded adjusting screws, whereby a neand accurate adjustment may be made and also whereby the elements andmembers may be zz locked in adjusted positions.

Still another object of the invention is to provice an improved tool, ofthe character described, which is constructed oi a minimum number ofparts and which is simple and economical in manufacture.

A construction designed to carry out the invention will be hereinafterdescribed, together with other features of the invention.

The invention will be more readily understood.

al U

Figure 3 is an enlarged, transverse, vertical, sectional view, taken onthe line 3 3 of Figure l,

Figure 4 is an enlarged sectional View oi the hinge for the splithousing and taken on the line #l-fi of Figure 1,

Figure 5 is a transverse sectional View, taken on the line 5--5 ofFigure 2,

Figure 6 is an isometric View of the cutter element, and

Figure 7 is an isometric view of one of the guide elements.

In the drawing, the letter A designates a split housing which is formedof two sections Ill and il. The section lo is of a greater semi-circularextent than the section il and said sections are hinged together bymeans of a link l2. The link is disposed within a recess i3 formed inthe sections i@ and il and suitable hinge pins it fasten the linkswithin said recess. Obviouslys the sections iil and il may be movedoutwardly with relation to each other, whereby they may be readilyengaged around a shaft. The outer ends of the sections il and ii areformed with flanges iii which are adapted to abut each other when thehousing is closed, as shown in Figure 1. A suitable fastening bolt itand nut il serve to secure the abutting anges i5 together and therebyfasten the housing in its closed position around the shaft.

Each section of the housing A is constructed of a main body portion i8and a plate i9 which is secured to one side of said body portion bymeans of rivets 2i), or other fastening means, as is clearly shown inFigure 3. The body portion is formed with a plurality of openings Ziwhich extend inwardly from the periphery of said body, said openingsbeing arranged to receive a rod, or other element, whereby a manualrotation may be irrparted to the device. elements G are mounted in thesections Iii and H and are disposed radially therein. In addition to theguide elements G, a radially extending cutter element; C is also mountedin the housing. Since the section lil of the housing is larger insemi-circular extent than the section ll, four guide elements G and thecutting element C are mounted in this larger section, while theremaining guide elements, which are four in number, are mounted in thesection li. The guide elements, as well as the cutter element C, aremounted in the same manner within the housing and it is believed that adescription of one will sumcey For mounting each element radially withinthe A plurality of guide k housing A, the body I8 of each section isformed with a plurality of openings or bores 22 which extend inwardlyfrom the inner periphery of the body, the number of said openings orbores corresponding to the number of elements to be mounted in thehousing. Each bore is angular, being shown as substantially square, incrosssection and one side of said bore is formed by the inner face ofthe plate I9 which is secured to the body portion I8 of each section, asis clearly shown in Figure 2. The `extreme outer end of each bore 22 isprovided with an annular recess or groove 23 and that portion of thebore beyond the recess or groove is circular, as indicated at 24.

Each guide element G includes a head 24a, which is substantiallysemi-circular in crosssection, whereby the head presents a roundedsurface to the shaft (not shown) which extends through the device. Thehead 24a is provided with an elongate shank 25 which is preferably madeintegral with, and which is angular, being shown substantially square incross-section. The square shank 25 is adapted to have a sliding fitwithin the square bore 22 (Figure 2), whereby the guide head 24 may bemoved inwardly and outwardly in a radial path, with respect to thecenter of the shaft extending through the housing A. The shank 25 isformed with an axial bore 26 which is internally screw-threaded andwhich is arranged to receive a threaded pin 21 or screw. The threadedpin or adjusting screw 21 is preferably formed integral with a flangedcollar 28, which collar is disposed within the circular portion of thebore 24 and annular groove or recess 23, as is clearly shown in Figure2. The collar 28 is provided with a bolt head 29, which head is disposedbeyond the outer periphery of the housing A.

Manifestly, with this arrangement, the ange of the collar 28 is confinedwithin the groove 23 and said collar may undergo rotation,' but is notcapable of an axial movement within the bore of the housing. The guidehead 24a and shank 25 are held against movement within the bore 22 bymeans of said shank being square and in engagement within the squarebore. Therefore, when the adjusting nut 29 is rotated, a rotation isimparted to the adjusting screw 21, with the result that the shank andhead 24a are moved radially with respect to the center of the shaftwhich extends through the device A. By making the screw threads on theadjusting screw 21 and within the bore 26 of the shank relatively fine,it is possible to obtain a very fine adjustment of the guide head 24a.Also, the screw threads serve as a locking means for holding the head invarious adjusted positions.

The cutter element C is mounted within one of the bores 22 in exactlythe same manner as the guide element G, heretofore described. Thiscutter element includes a square shank 30 which is formed with anenlarged head 3| at its outer end. The shank has a threaded opening orbore 32 therein for receiving one of the adjusting screws 21 in themanner hereinbefore set forth. The enlarged head 3l at the outer end ofthe shank 30 is formed with a longitudinal groove or recess 33, which isadapted to receive the cutter blade 34. As is clearly shown in Figure 6,the cutter blade has its lower end inclined to provide a sharp point orcutting edge 35. Manifestly, since the cutting element is mounted in thesame way as the guide elements, it is capable of a radial adjustment andmovement relative to the center of the shaft which extends through thehousing A.

It is pointed out that the various guide elements G are disposed withinthe housing A in such a manner that the center of each guide element isaligned with the center of the shaft around which the housing isengaged. Such alignment is effected by locating the bores 22 in a mannerwithin the housing so that the center line of each bore intersects thecenter of the housing and the center of the shaft, as indicated by thelines L in Figure 1. However, the center line of the bore 22 withinwhich the shank 30 of the cutter element C is mounted, is offset a fewdegrees, whereby its center line does not intersect the center of theshaft. The offsetting of this bore is such as to locate the verticalface of the cutter blade 34 in direct radial alignment with the centerof the shaft, whereby the cutting point or edge 35 of said blade isaligned with said center. In this manner, it will be evident that uponrotation of the housing A, the cutting edge 35 is at all times alignedwith the center of the shaft during the cutting operation. This is animportant feature of the invention for it provides for a smoother andmore even cutting and also eliminates chatter during the cuttingoperation. It is noted that the bore 22 within which the cutter elementis mounted could be aligned with the center of the housing and shaft,and the cutter blade offset relative to the head 3| and shank 36 todispose the cutting edge in radial alignment with the center of thehousing and shaft.

From the above, it will be obvious that a simple and efficient cuttingtool is provided. The guide elements G are adjusted so as to contact theouter surface of the shaft which is being worked upon and said elementsserve to center and hold the shaft in position. The cutter element C,being disposed as above explained, cuts or turns the outer surface ofsaid shaft to true up said shaft. The device is hand operated and may beapplied to the shaft without removing the same from the particularengine or machine with which it is associated. Obviously, the unevenlyworn surfaces of the shaft or those portions of said shaft which havebeen scored may be made smooth. The particular arrangement, whereby thevarious elements may be adjusted provides a very simple and effectiveway for effecting such adjustments. Each guide element, as well as thecutting element, may be individually adjusted to a very fine point anddue to the threaded adjusting screws, each element is locked in itsadjusted position.

The foregoing description of the invention is explanatory thereof andvarious changes in the size, shape and materials, as well as in thedetails of the illustrated construction, may be made, within the scopeof the appended claims, without departing from the spirit of theinvention.

What I claim and desire to secure by Letters Patent is:

1. A cutting tool including, a housing formed of arcuate sections hingedtogether and having a central opening when the sections are swungtogether, the housing having a plurality of radially disposed boreswhich have their centers aligned with the center of the housing, a guidemember mounted in each bore and having its inner end extending inwardlybeyond the inner periphery of the housing, said housing also having abore which is offset from the center of the housing, a cutter elementmounted in said lastnamed bore, the oiset of said bore locating thecutting edge of the cutter in radial alignment with the center of thehousing, means for moving the guide members and cutting element withtheir respective bores to adjust the same radially, and means forlocking the members and elements in their various adjusted positions.

2. A cutting tool including, a housing formed of arcuate sections hingedtogether and having a central opening when the sections are swungtogether, the housing having a plurality of radially disposed bores,each bore having its major portion angular in cross-section with itsremaining portion cylindrical, said bore also having an annular groovein its wall disposed between the angular and cylindrical portions, acutter element mounted in one of the bores and guide elements mounted ineach of the remaining bores, each guide and the cutter element having anan ular shank slidable in its respective bore, an adjusting screwextending axially through each bore and having threaded engagement withthe shank of the element therein, and a flanged collar on the adjustingscrew co-acting with the annular groove and the cylindrical portion oithe bore to permit a rotation of the screw while preventing an axialmovement thereof, whereby each screw may be rotated to impart movementto its respective element.

3. A cutting tool including, a housing formed o arcuate sections hingedtogether and having a central opening when the sections are swungtogether, the housing having a plurality of radially disposed bores,each bore having its major portion angular in cross-section with itsremaining portion cylindrical, said bore also having an annular groovein its wall disposed between the angular and cylindrical portions, acutter element mounted in one oi` the bores and guide elements mountedin each of the remaining bores, each guide and the cutter element havingan angular shank slidable in its respective bore, an adjusting screwextending axially through each il?. d)

bore and having threaded engagement with the shank of the elementtherein, and a flanged collar on the adjusting screw co-acting with theannular groove and the cylindrical portion of the bore to permit arotation of the screw while preventing an axial movement thereof,whereby each screw may be rotated to impart movement to its respectiveelement, the bores within which the guide elements are mounted havingtheir centers aligned radially with the center of the housing and thebore within which the cutter element is mounted having its center offsetfrom radial alignment with the center of the housing, whereby thecutting edge of said cutting element is aligned with the center of thehousing.

4. A cutting tool including, a housing formed of arcuate sections hingedtogether and having a central opening when the sections are swungtogether, the housing having a plurality of radially disposed bores,each 'bore having its major portion angular in cross-section with itsremaining portion cylindrical, a cutter element, having an elongatecutting blade which extends transversely thereacross mounted in one ofthe bores and guide elements mounted in each of the remaining bores,each guide and the cutter element having an angular shank slidable inits respective bore, and rotatable means within the cylindrical portionof each bore conned against longitudinal movement therein and engagingthe shank of the element for imparting movement to the bore, wherebyradial adjustment of the elements may be effected, the bores withinwhich the guide elements are mounted having their centers alignedradially with the center of the housing and the bore within which thecutter element is mounted having its center offset from radial alignmentwith the center of the housing, whereby the cutting edge of said cuttingelement is aligned with the center of the housing.

HUGO GOSSTROM.

